Perpetual calendar



A. J. BERG PERPETUAL CALENDAR Filed Feb. 24, 1947 OCTOBER JANUARY JULY- APRIL SEPTEMBER JUNE I UGUST MAY AUGUSTF. JOii-PH BERG INVENTOR. WM

' A TTOR/YEX Patented May 15, 1951 PERPETUAL CALENDAR Auguste Joseph Berg, New York, N. Y.

Application February 24, 1947, Serial No. 730,515 In France May 25, 1946 1 Claim.

This invention relates to calendars of the socalled perpetual calendar type, that is of the type in which a compact arrangement of days of week, of months and of years, shows almost at a glance the day of the week for any day of the month in any given year of a considerable number, and conversely shows day of month for day of week.

Perpetual calendars have been prepared in the form of printed-tables of various columns provided with tables of cross-indexes, but such are cumbersome to use, require each day to be specially looked up, and are both confusing to use and not settable, that is, cannot be set for a given week or given month, so that other days of the week or month can be read off at a glance.

According to the present invention, a calendar is provided with a movable element, preferably a single moving element, and the arrangement of days of the week and month and year is such that once set for a given month, all other days of that month are seen at a glance as days of both month and week.

It is found possible to make a complete accurate perpetual calendar with four columns united in pairs of columns so that one pair is movable relatively to the other pair. Preferably, one pair shows years and days of week, while the other pair shows months and days of month.

In the form shown, the calendar is illustrated as a desk device with a single rotatable part and adapted to be easily read at a distance of three feet, but on a smaller scale the parts may be small enough to form a device easily carried in the pocket, such as on the upper end of a fountain pen.

Other features and advantages will hereinafter appear.

In the accompanying drawings:

Fig. l is a perspective front view of one form of desk calendar of the present invention.

Fig. 2 is a rear perspective view partly broken away.

Fig. 3 is a projected flat of the names and numbers of the form shown.

In the form shown, a frame having ends I0, and a front base board H, carries a shaft I2 journalled in the ends I0, and provided with end knobs I3 so that the knobs I3 may turn a drum I4 carried near the center of the shaft I2.

In the form shown, the drum I4 carries on its surface a printed sheet I5, showing the seven days of the week along one edge I6, and along the other edge I1, numbers of the years for a convenient space of time, as from 1940 to 1972,

aligned opposite the appropriate days of the week, as now to be described.

The days of the week along the edge I6 lie adjacent the numbered 31 days of a month, in weekly columns of vertical sequence along the edge I8 and adjacent columns of a fixed cylinder I9. The names of the days of the week may be thus carried by the rotating drum l4 so that any given day of the week may be brought to align with any given day of the month, either against one of the first seven days of the month, or aligned with the day of month number corresponding to the same week day.

Thus, the days of the month may be readily read off against the corresponding days of week.

In the form shown, the names of the months are arranged along an edge 29 in seven lines opposite the numbers of the first seven days of the month. The edge 20 is shown as the edge of a fixed cylinder 21 lying against the edge I! on the drum I4.

Then when it is desired to read the monthly calendar for the month of October 1949 the knob I3 is turned to the year 1949 (shown as 49) opposite the line for October, and it will then be easily read that the first day of October is Saturday. The other days of the week then appear against the corresponding days of the month.

Similarly, the calendar for any other month in any other year shown on the sheet I5 may be read off by turning the knob I3 to bring the year shown on the sheet I5 to the desired month name on the cylinder 2|.

In the form shown, no correction of addition or subtraction for leap years is needed. To attain this result the months January and February for leap years are shown in italics aligned with July and August respectively, on the cylinder 2|.

If that italic setting of a month is used for January and February of leap years, the calendar will read correctly, and the numbers of the years are so arranged on the sheet [5 that the setting for March and later leap year months show the correct calendar days in all years.

Thus, when the drum I4 is turned to February, aligned with 1948, a leap year, the week day Sunday will begin the month, and March will show Monday when set for March.

If desired, the italic January and February may be printed in distinctive lettering which may be red and the leap years 1940, 1944, 1948, etc. printed in distinctive lettering which may be red to serve as a guide to set a red year to a red month where possible.

To condense the columns on the sheet 15, the years are shown only by their last two digits,

(omitting the 19's) For convenience the sheet [5, in the form shown, carries the data of two weeks beginning on a Monday, and running to the second Saturday, with the result that a full list of the days of the week may always be visible between the front base board [I and the front of the cover 22, and a single set of lines of the months from October-January to May in seven lines are visible over the same width and a single showing of a calendar in seven-day weeks appears along the edge l8. 7

With this arrangement the fixed cylinders 19 and 2| need carry only half cylindrical surfaces, or less, and their backs may be cut away as seen in Fig. 2.

The drum M in order to balance evenly may be counterweighted by being a complete dru-m as shown instead of being cut away.

In the form shown, the shaft I2 may carry a pointer 24 having a bent over point adapted to indicate a chosen line on the calendar and held by friction in any set position, but easily reset.

It will be noted that the sheet I5 is a separable sheet and may be replaced, as years go by, by another sheet, or a new sheet l5 pasted over it with new series of years shown upon it.

Having thus described one form of the invention in some detail, what is claimed is:

In a single motion perpetual calendar, the com bination with a part cylindrical fixed member carrying names of months arranged in seven lines upon the surface, including January and February in distinctive type on each of two lines, of a second part cylindrical fixed member spaced axially from the first and carrying days of a month arranged in seven lines aligned with the mon'thaname lines, and a rotatable cylindrical surface member having the same axis as said part cylindrical members and lying between them and carrying the major part of two series of indicia of the days of the week and year numbers aligned therewith, With leap years specially marked.

AUGUSTE JOSEPH BERG.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 476,461 I-Iochheimer June 7, 1892 476,462 Hochheimer June 7, 1892 505,313 Hotzman Sept. 19, 1893 FOREIGN PATENTS Number Country Date 641 Great Britain Jan. 14, 1890 16,658 Great Britain of 1890 358.026 Great Britain Mar. 27, 1930 

